The Plateau of Gorgoroth was a plateau in north-western Mordor in the midst of which stood Mount Doom. To the east of Mount Doom upon a spur of the Ered Lithui, Sauron constructed his fortress of Barad-dûr. During the War of the Ring, Gorgoroth was the location for the mines and forges that produced Mordor's arms and armour.

To the south and east of Gorgoroth plateau lay the more fertile lands of Nurn which contained vast slave-tilled fields.